package week5;
import java.util.Scanner;
/**
 * Created by dell on 2017/3/23.
 */
public class TryCatchAverage {
    public static void main(String[] args ) {
        Scanner console = new Scanner(System.in);
        double sum = 0;
        int count = 0;
        while(true) {
            int number = console.nextInt();
            if(number == 0) {
                break;
            }
            sum += number;
            count ++;
        }
        System.out.printf("平均 %.2f%n", sum / count);
    }
}
